android獲取view寬高的幾種方法

在onCreate方法中我們通過mView.getWidth()和mView.getHeight()獲取到的view的寬高都是0，那么下面幾種方法就可以在onCreate方法中獲取到view的寬高。

1、

        int w = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED); int h = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED); mTextView.measure(w, h); int height = mTextView.getMeasuredHeight(); int width = mTextView.getMeasuredWidth(); System.out.println("measure width=" + width + " height=" + height);

2、mViewTreeObserver = mTextView.getViewTreeObserver();

        mViewTreeObserver.addOnGlobalLayoutListener(new OnGlobalLayoutListener() { @Override public void onGlobalLayout() { // TODO Auto-generated method stub mTextView.getViewTreeObserver().removeGlobalOnLayoutListener(this); System.out.println("onGlobalLayout width=" + mTextView.getWidth() + " height=" + mTextView.getHeight()); } });

3、

        mViewTreeObserver.addOnPreDrawListener(new OnPreDrawListener() { @Override public boolean onPreDraw() { // TODO Auto-generated method stub mTextView.getViewTreeObserver().removeOnPreDrawListener(this); System.out.println("onPreDraw width=" + mTextView.getWidth() + " height=" + mTextView.getHeight()); return true; } });

4、

    @Override
    public void onWindowFocusChanged(boolean hasFocus) { // TODO Auto-generated method stub  super.onWindowFocusChanged(hasFocus); if (hasFocus) { System.out.println("onWindowFocusChanged width=" + mTextView.getWidth() + " height=" + mTextView.getHeight()); } }

打印結果：